Recession Behavior of Yb2Si2O7 Phase Under High Speed Steam Jet at High Temperatures

Abstract

Recession behavior of Yb2Si2O7 phase was examined under high speed steam jet environment between 1300 C and 1500 C. Yb2SiO5 phase was formed on the bulk surface by the decomposition of Yb2Si2O7 phase and the elimination of silica component at elevated temperatures. The phase ratio of Yb2SiO5/Yb2Si2O7 increased up to 1400 C and then decreased above 1400 C. The relative intensity of 220 peak for Yb2Si2O7 phase increased with increasing the temperatures. Fine grains were generated on the bulk surface at 1300 C. The phase decomposition caused on the grain interior. A porous structure was formed on the bulk surface during the test at 1400 C. Surface cracks were generated for 1400 C test sample. A smooth surface was generated on the surface of 1500 C test sample. The triple points of the grains were bridged with a glassy phase.